PLECOPTERA OE NORTH AMERICA 261 



General color blackish brown. Head wider than pro- 

 thorax, blackish; lateral tubercles large, flat, polished; 

 occiput with longitudinal, polished, interrupted ridges; 

 hind ocelli about three times as close to eyes as to each 

 other; antennae blackish. Prothorax not wider than 

 long ; widened behind ; angles very broadly rounded ; sur- 

 face moderately rugose, the rugosities blackish. Legs 

 dark brown. Wings lightly fumose; Sc reaches almost 

 to the cord ; R of f orewing sinuate at origin of Rs. Abdo- 

 men brown, cerci brown, with almost twenty segments. 



Male. Hind margin of the eighth abdominal tergite pro- 

 duced upward and backward with a slight notch at the 

 apex, and before the apex a small blunt tubercle; supra- 

 anal process recurved, moderately slender at base, but 

 much enlarged before the apex, truncate and ending in 

 a slender pointed process ; subanal lobes ending in short, 

 upcurved, spine-like processes; ninth sternite slightly 

 produced and evenly rounded behind. 



Female, unknown. 



Holotype, male, Jan. 24, 1923, on snow, Feather River 

 Canyon, near Caribou, Plumas Co., Calif. (H. S. Barber, 

 in U. S. National Museum) ; paratypes, eight males, from 

 same locality. 



Capnia tumida Claassen. 



(Plate 48, fig. 9.) 

 1924. Capnia tumida Claassen, Can. Ent., 56:47. 



Length to tip of wings, male, 7.5 mm. Expanse, male, 

 12.5 mm. 



General color blackish brown. Head a little wider than 

 prothorax ; blackish ; lateral tubercles large, flat, polished ; 

 occiput with a number of longitudinal polished ridges; 

 hind ocelli about twice as close to eyes as to each other; 

 antennae blackish. Prothorax a little wider than long; 

 widened behind ; angles broadly rounded ; surface moder- 

 ately rugose, the rugosities blackish. Legs dark brown. 

 Wings lightly fumose; R of f orewing bent upwards at 

 origin of Rs. Abdomen dark brown; cerci brown, com- 

 posed of about nineteen segments. 



Male. Seventh abdominal tergite with a raised, black 

 knob which is emarginate behind ; ninth and tenth ter- 

 gites each with a median depression ; supra-anal process 

 recurved, bifid, much enlarged at the base and tapering 

 to a blunt double point ; on the anterior portion of the 

 bulbous enlargement a row of bristles ; the enlargement 

 wider than long, flattened above ; subanal lobes ending in 



